<!doctype html>
<style>
svg {
  display: none;
}
canvas {
  border: 1px solid black;
}
</style>

<svg id="s1" width="200px" height="20px">
  <image id="img1" href="resources/pattern.png" x="0" y="0" width="20px" height="20px" />
  <image id="img2" href="resources/pattern.png" x="20" y="0" width="40px" height="40px" />
  <image id="img3" href="resources/pattern.png" x="40" y="0" width="40px" height="40px" />
  <image id="img4" href="invalid" x="60" y="0" width="20px" height="20px" />
  <image id="img5" href="resources/pattern.png" x="80" y="0" width="20px" height="20px" />
  <image id="img6" href="resources/rect.svg" x="100" y="0" width="20px" height="20px" />
  <image id="img7" href="resources/empty.svg" x="120" y="0" width="20px" height="20px" />
  <image id="img8" href="resources/zeroSize.svg" x="140" y="0" width="20px" height="20px" />
</svg>

<canvas id="c1" width="20" height="20"></canvas>
<canvas id="c2" width="20" height="20"></canvas>
<canvas id="c3" width="20" height="20"></canvas>
<canvas id="c4" width="20" height="20"></canvas>
<canvas id="c5" width="20" height="20"></canvas>
<canvas id="c6" width="20" height="20"></canvas>
<canvas id="c7" width="20" height="20"></canvas>
<canvas id="c8" width="20" height="20"></canvas>

<script>
var draw = function(target, img, x, y) {
  document.getElementById(img).addEventListener("load", function() {
    document.getElementById(target).getContext("2d").drawImage(
      document.getElementById(img), x || 0, y || 0);
  });
};

draw("c1", "img1");
draw("c2", "img2", 10, 10);
draw("c3", "img3");
draw("c4", "img4");
document.getElementById("c5").getContext("2d").drawImage(
  document.getElementById("img5"), 0, 0);
draw("c6", "img6");
draw("c7", "img7");
draw("c8", "img8");

</script>
